.\" Modified 2002-07-27 by Walter Harms
.\" (walter.harms@informatik.uni-oldenburg.de)
.\"
-.TH TANH 3 2008-08-05 "" "Linux Programmer's Manual"
+.TH TANH 3 2010-09-20 "" "Linux Programmer's Manual"
.SH NAME
tanh, tanhf, tanhl \- hyperbolic tangent function
.SH SYNOPSIS
.ad l
.BR tanhf (),
.BR tanhl ():
-_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE\ >=\ 600 || _ISOC99_SOURCE; or
+.RS 4
+_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE\ >=\ 600 || _ISOC99_SOURCE ||
+_POSIX_C_SOURCE\ >=\ 200112L;
+.br
+or
.I cc\ -std=c99
-.ad b
+.RE
+.ad
.SH DESCRIPTION
The
.BR tanh ()